How did you fasten it up on the top side of the rocker panel, below the doors? That's my trouble point. The bottom side looks easy with using the m/f plastic tabs. The holes are pretty much there for you. I noticed on the inside part of the skirts, 5 flat sections that I assume slide over the brackets to snug up next to the rocker panel.
Do you have any pics you could share? I'm hoping someone can post a pic of the bracket then I can get some ideas from that.

Thanks for you post.